Chlamydia

This affects both men and women, and any age group. It is the most common bacterial STI amongst young men and women, affecting 1 in 12 sexually active young people under the age of 25. Often there are no symptoms so people don’t know they have it .

How you get it:

Unprotected vaginal or anal penetrative sex

Oral sex

Sharing sex toys that aren't washed or covered with a new condom each time they're used

The genitals coming into contact with another person’s genitals – this means you can get chlamydia from someone even if there is no penetration, orgasm or ejaculation

Infected semen or vaginal fluid getting into your eye

Symptoms:

Most of the time, none, but sometimes pain when peeing (male), lower abdominal pain (female) or discharge from the vagina or penis.

If it’s not treated

It can lead to pelvic inflammatory disease in women; this can lead to infertility in both men and women

Men can get painful swollen testicles

Men can also get a rare form of arthritis (SARA- Sexually Acquired Reactive Arthritis)

Treatment:

Is a simple course of antibiotics - this is generally 1 tablet twice a day for one week.